Key Not Detected Mercedes ; Full Troubleshooting & Case Study (FBS4) When a Mercedes shows “Key Not Detected”, the immobilizer chain has broken somewhere between the key fob, LF antennas/receivers, Keyless-Go control unit, and EIS/EZS (electronic ignition). On FBS4 vehicles, ...
Mercedes Key Not Working Ignition; Real Case Study & Expert Diagnosis (S350 W222) When your Mercedes key doesn’t work in the ignition no dashboard lights, no multimedia response, and complete electrical silence it’s more than an inconvenience.This type of failure ...